Once you find the mac address that’s registered to a host other than the one requesting, you can blacklist the mac address by part or whole.

You would goto FOG Configuration Page->FOG Settings->Quick Reg, and something like Pending Mac Filters (I can’t see right now as what we’re working on is not able to view the fog settings currently.) I’ll update with the direct link as soon as I can.

@tyler2017 typically multiple hosts error means a MAC address that is registered to another host is being presented with this host. This Mac could be anything though. VM macs are fairly common as the vm software installed within the image contains the exact same information for all hosts.